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-rw-r--r--src/blind-affine-colour.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/blind-affine-colour.c b/src/blind-affine-colour.c
index f7bda25..2c45460 100644
--- a/src/blind-affine-colour.c
+++ b/src/blind-affine-colour.c
@@ -41,7 +41,7 @@ main(int argc, char *argv[])
SELECT_PROCESS_FUNCTION(&colour);
if (skip_alpha && colour.alpha_chan != -1)
- CHECK_CHANS(&colour, == colour.n_chan - 1, == colour.luma_chan);
+ CHECK_CHANS(&colour, == (short int)(colour.n_chan - 1), == colour.luma_chan);
else
skip_alpha = 0;